How long does oat milk last in the fridge?
Quick answer
- In the fridge
- Opened: about 5–7 days · Chilled, unopened: about 2 months from production
- In the pantry
- Shelf-stable, unopened: close to a year
Sources: Oatly — Does oat milk go bad? · Last reviewed October 1, 2026
Oat milk lasts about 5–7 days in the fridge after opening, when stored below 4°C. Unopened shelf-stable cartons keep close to a year; chilled cartons about two months from production. Barista-style oat milk often lasts a few days less than regular due to higher fat content. Once opened, expect natural separation and gradual flavor decline; sour smell, slimy texture, or off taste mean spoilage. Shake well before each use to redistribute solids.
How to store oat milk
Refrigerate opened oat milk on a middle shelf, tightly sealed. Keep unopened shelf-stable cartons in a cool dry pantry. Avoid the fridge door — temperature swings shorten its life. Oat milk separates naturally as the fiber settles; shake hard before pouring. Freezing changes texture irreversibly, so freeze only for cooking. Once opened, smell-check before each use after the first few days.
- Middle shelf in original carton, sealed
- Pantry until opened
- Shake hard before each pour
- Avoid the fridge door
- Freeze only for cooking
Signs it has gone bad
- Sour or off smell
- Slimy or thickened texture
- Bitter or off taste
- Visible mold or unusual color
Frequently asked questions
How long does oat milk last after opening?
Opened oat milk lasts about 5–7 days in the fridge below 4°C. Unopened shelf-stable cartons keep close to a year.
Why is my oat milk slimy?
Slimy texture usually means it's gone bad — bacteria break down the oats. Throw it out.
Can you freeze oat milk?
Yes for cooking, but the texture separates after thawing; not great for drinking plain or in coffee.